<template>
  <div>
    <!--面包屑导航区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/welcome' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>数据统计</el-breadcrumb-item>
      <el-breadcrumb-item>数据报表</el-breadcrumb-item>
    </el-breadcrumb>  
    <!--卡片视图区域-->
    <el-card>
      <!--2.为echarts准备一个DOM-->
      <div id="main" style="width: 600px;height:400px;"></div>
    </el-card>
  </div>
</template>

<script>
  import _ from 'lodash';
  export default{
    data() {
      return {
        // 需要合并的数据
        options: {
          title: {
            text: '用户来源'
          },
          tooltip: {
            trigger: 'axis',
            axisPointer: {
              type: 'cross',
              label: {
                backgroundColor: '#E9EEF3'
              }
            }
          },
          grid: {
            left: '3%',
            right: '4%',
            bottom: '3%',
            containLabel: true
          },
          xAxis: [
            {
              boundaryGap: false
            }
          ],
          yAxis: [
            {
              type: 'value'
            }
          ]
        }
      }
    },
    //此时页面上的元素已经被渲染完毕
    async mounted() {
      // 3. 基于准备好的dom，初始化echarts实例
      var myChart = this.$echarts.init(document.getElementById('main'))

      const { data: res } = await this.$http.get('reports/type/1')
      if (res.meta.status !== 200) {
        return this.$message.error('获取折线图数据失败！')
      }

      // 4. 准备数据和配置项
      const result = _.merge(res.data, this.options)

      // 5. 展示数据
      myChart.setOption(result)
    },
  }
</script>

<style scoped>
.el-breadcrumb{
  margin-bottom: 15px;
  font-size: 12px;
}
</style>